Rock-drill.



B. HASTINGS.

' ROCK DRILL. APPLICATION FILED MAY 2, 1906.

Patented Mar. 30,1909.

z Ti F II Inn/1w? I larger piston hammer involves added weight, in addition to which the reaction of the device necessitates the use of a tripod, tunnel bar, column, or other mechanical holding de--' vice. M device,- on account of the small length of bit employed, does not require any larger piston hammer for dee holes than-for shal 0w ones, -and the weig t and reaction of the device under operating conditions are not too great to allow of its being held inthe hand of the operator. Hence, itwill be seen that by my invention I dispense with the holding device heretofore required for all drills employed informing holes, exceeding 3 feet in length. Under 0 crating conditions, the operator starts aole in'the manner usual with the so called pneumatic hammer drills, but instead of substituting a lon er drill lit for the shorter one as the hole gee ens, e permits the casing B to enter the ho e drilled and from time to time adds handle sections E to said casing. A blast of expansile fluid passing out through the bit forces the cuttin u 'on the outside of the casing and attac ed andle to the surface of the rock being drilled. The drill-bit'shank'has a polygonal or equivalent section and fits into a like hole in the lower end of the casing as shown in section Fi .3 whereby the b1t is permitted an axial ut not rotative movement relative to the casing.

What I claim is: q 1. The combination with a piston ham'- mer drill, of a drill bit whose diameter-of cut is wider than the largest outsidediameterof said piston hammerdrill, said piston ham-r mer drill being adapted for entrance into the hole made by it, substantially as described.

2. The-combination-with a piston hammer j drill, of a straight hollow handle attached to andiformin a communicationwith said drill, and a dri bit of wider diameter of out I tlan the outsid'edimensionsof'saiddrill and hand: a, substantially; as described.

3. The combination with-a iston hammer drill, of a plurality of hollow andle sections adapted to be attached to each other and to the piston hammer drill to form a conduit drill, of a hollow holding device having--l attached drill bit ofsufiicient'gage to from an expansile fluid su ply. to the piston hammer drill,- and a dr' bit of sufiicient age to allow; the entrance vof said-piston ammer drill; and attached handle sections a into the hole "being drilled, substantiallyas described. v v

'4. r The combination with a piston hammer,

a ow the entrance of the drill and the holding device into the hole bein drilled, {and asuit-- whereby said device and its attached piston hammer drill and bit may be turned in the hole being drilled, substantially as described.-'

ated upon by said drill operating mechanlsm,

substantially as described; I

v 6. The combination of a series of tubular, detachably connected handle sections, with a casing removably connected to one of said sections and a piston hammer drill operatin mechanism inclosed, by said casing, sai casing adapted to receive a drill and being of substantially the same diameter as sai sections throughout its length, substantially as described.

7-. The combination of a seriesof tubular, detachably connected handle sections, with a casing removably connected to one of said v sections and a piston hammerdrill operating mechanism inclosed by said casing, said casing adapted to receive a drill, said sectionsand casing being of substantially the same diameter throughout their-length, one of said sections having a lever whereby the sections maybe axially turned, substantially as described.

8. The combination of a series of detachsubstantially uniform diameter connected at one .end to a source of fluid under pressure, an operatin lever on said section adjacent to said en a casing'ofsubstantially the same diameter as said series of sections removably connected to the o posite end thereof, and piston hammer dr' in said a casing, substantially as described.

9. A piston hammer dril havinga casing described. v J HASTINGS.

Witnesses: F K E able lever on said ho ldWholding device Wmrrnnn A. BRENNAN,

ably connected tubular handle sections of mechanism containing drill operating mechanism, said casing being extended to the rear of said mecglanism and forming-an extended tubulardrill including "a casing containing drill operating mechanism,

mechanism into the hole formed by t e drill, 

